Our solar system may have hosted up to six giant planets in its first hundred million years, a new study suggests. The ...

We usually think of our Solar System as a calm, well-organized family of planets, but a new study suggests its early days may ...

Every planet in the Solar System, including Earth, orbits a shared center of mass rather than the geometric center of the Sun ...

The outer solar system once seemed like a quiet backwater. But a glut of tiny, strange moons with unruly orbits are coming ...

A study recently submitted to The Astronomical Journal continues to search for the elusive Planet Nine (also called Planet X), which is a hypothetical planet that potentially orbits in the outer ...

ESA's Gaia mission has determined he orbits of 154,741 asteroids in our solar system. [Gaia spacecraft: Mapping the Milky Way ...

An international team of astronomers has discovered eight new extrasolar planets, bringing to nearly 80 the number of planets found orbiting nearby stars. The latest discoveries, supported by the ...

Jupiter, Saturn, Uranus and Neptune did not always have their current positions in the solar system. According to the ...

For the inner four planets in this solar system, each planet orbits the sun three times for every two orbits of the planet immediately to its outside. For the fourth, fifth and sixth planets, they ...

EVANSTON, Ill. — Except for the fact that we call it home, for centuries astronomers didn’t have any particular reason to believe that our solar system was anything special in the universe. But, ...